<template>
  <div class="type-nav">
    <div class="container">
      <div @mouseenter="enterShow" @mouseleave="leaveShow">
        <h2 class="all">全部商品分类</h2>
        <!-- 过渡动画 -->
        <transition name="sort">
          <div class="sort" v-show="show">
            <div class="all-sort-list2" @click="goSearch">
              <div class="item" v-for="(c1,index) in categoryList" :key="c1.categoryId" :class="{ cur: currentIndex==index }">
                <h3 @mouseenter="changeIndex(index)">
                  <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                </h3>
                <div :style="{display:currentIndex==index?'block':'none'}"
                  class="item-list clearfix">
                  <div class="subitem" v-for="(c2, index) in c1.categoryChild" :key="c2.categoryId">
                    <dl>
                      <dt>
                        <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                      </dt>
                      <dd>
                        <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                          <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import {mapState} from 'vuex'
import throttle from 'lodash/throttle'

export default {
  name: "TypeNav",
  data(){
    return {
      currentIndex: -1,
      show: true,
    }
  },
  mounted(){
    if (this.$route.path != "/home") {
      this.show = false;
    }
  },
  computed:{
    ...mapState({
      categoryList:state=>state.home.categoryList
    })
  },
  methods:{
    changeIndex: throttle(function(index){
      this.currentIndex = index;
    }, 50),
    enterShow() {
      if (this.$route.path != "/home") {
        this.show = true;
      }
    },
    leaveShow() {
      this.currentIndex = -1;
      if (this.$route.path != "/home") {
        this.show = false;
      }
    },
    goSearch(event){
      let elem = event.target
      let {categoryname, category1id, category2id, category3id} = elem.dataset
      
      if(categoryname){
        let location = {name: 'search'}
        let query = {categoryName: categoryname}

        if(category1id){
          query.category1Id = category1id
        }else if(category2id){
          query.category2Id = category2id
        }else{
          query.category3Id = category3id
        }

        if(this.$route.params){
          location.params = this.$route.params
          location.query = query
          this.$router.push(location)
        }        
      }
    }
  }
}
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
            &.cur {
              background: skyblue;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }
        }
        .cur{
          background-color: skyblue;
        }
      }
    }
    //过渡动画的样式
    //过渡动画开始状态（进入）
    .sort-enter {
      height: 0px;
    }
    // 过渡动画结束状态（进入）
    .sort-enter-to {
      height: 461px;
    }
    // 定义动画时间、速率
    .sort-enter-active {
      transition: all 0.5s linear;
    }
  }
}
</style>
